keyboard/lightpad/matrix.c

   1 /*
   2 Copyright 2014 Ralf Schmitt <ralf@bunkertor.net>
   3
   4 This program is free software: you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation, either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 #include <stdint.h>
  19 #include <stdbool.h>
  20 #include <avr/io.h>
  21 #include <util/delay.h>
  22 #include "print.h"
  23 #include "debug.h"
  24 #include "util.h"
  25 #include "matrix.h"
  26 #include "eeconfig.h"
  27 #include "action_layer.h"
  28 #include "backlight.h"
  29
  30 #ifndef DEBOUNCE
  31 #   define DEBOUNCE 0
  32 #endif
  33 static uint8_t debouncing = DEBOUNCE;
  34
  35 static matrix_row_t matrix[MATRIX_ROWS];
  36 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  37
  38 static uint8_t read_rows(void);
  39 static uint8_t read_fwkey(void);
  40 static void init_rows(void);
  41 static void unselect_cols(void);
  42 static void select_col(uint8_t col);
  43
  44 inline
  45 uint8_t matrix_rows(void)
  46 {
  47     return MATRIX_ROWS;
  48 }
  49
  50 inline
  51 uint8_t matrix_cols(void)
  52 {
  53     return MATRIX_COLS;
  54 }
  55
  56 void misc_init(void) {
  57 }
  58
  59 void matrix_init(void)
  60 {
  61     backlight_init_ports();
  62     unselect_cols();
  63     init_rows();
  64     for (uint8_t i=0; i < MATRIX_ROWS; i++)  {
  65         matrix[i] = 0;
  66         matrix_debouncing[i] = 0;
  67     }
  68 }
  69
  70 uint8_t matrix_scan(void)
  71 {
  72     for (uint8_t col = 0; col < MATRIX_COLS; col++) {
  73         select_col(col);
  74         _delay_us(3);
  75         uint8_t rows = read_rows();
  76         // Use the otherwise unused col: 0 row: 0 for firmware key
  77         if(col == 0) {
  78             rows |= read_fwkey();
  79         }
  80         for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
  81             bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
  82             bool curr_bit = rows & (1<<row);
  83             if (prev_bit != curr_bit) {
  84                 matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
  85                 if (debouncing) {
  86                     dprint("bounce!: "); dprintf("%02X", debouncing); dprintln();
  87                 }
  88                 debouncing = DEBOUNCE;
  89             }
  90         }
  91         unselect_cols();
  92     }
  93
  94     if (debouncing) {
  95         if (--debouncing) {
  96             _delay_ms(1);
  97         } else {
  98             for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  99                 matrix[i] = matrix_debouncing[i];
 100             }
 101         }
 102     }
 103
 104     return 1;
 105 }
 106
 107 bool matrix_is_modified(void)
 108 {
 109     if (debouncing) return false;
 110     return true;
 111 }
 112
 113 inline
 114 bool matrix_is_on(uint8_t row, uint8_t col)
 115 {
 116     return (matrix[row] & ((matrix_row_t)1<<col));
 117 }
 118
 119 inline
 120 matrix_row_t matrix_get_row(uint8_t row)
 121 {
 122     return matrix[row];
 123 }
 124
 125 void matrix_print(void)
 126 {
 127     print("\nr/c 0123456789ABCDEF\n");
 128     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 129         xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row)));
 130     }
 131 }
 132
 133 uint8_t matrix_key_count(void)
 134 {
 135     uint8_t count = 0;
 136     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 137         count += bitpop32(matrix[i]);
 138     }
 139     return count;
 140 }
 141
 142 /* Row configuration
 143  *
 144  * row: 0    1    2    3    4    5
 145  * pin: PD0  PD1  PD2  PD3  PD5  PB7
 146  *
 147  * Firmware uses pin PE2
 148  */
 149 static void init_rows(void)
 150 {
 151     DDRD  &= ~0b00101111;
 152     PORTD |=  0b00101111;
 153
 154     DDRB  &= ~0b10000000;
 155     PORTB |=  0b10000000;
 156
 157     DDRE  &= ~0b00000100;
 158     PORTE |=  0b00000100;
 159 }
 160
 161 static uint8_t read_rows(void)
 162 {
 163     return (PIND&(1<<0) ? (1<<0) : 0) |
 164            (PIND&(1<<1) ? (1<<1) : 0) |
 165            (PIND&(1<<2) ? (1<<2) : 0) |
 166            (PIND&(1<<3) ? (1<<3) : 0) |
 167            (PIND&(1<<5) ? (1<<4) : 0) |
 168            (PINB&(1<<7) ? (1<<5) : 0);
 169 }
 170
 171 static uint8_t read_fwkey(void)
 172 {
 173     return PINE&(1<<2) ? 0 : (1<<0);
 174 }
 175
 176 /* Column configuration
 177  *
 178  * col: 0    1    2    3
 179  * pin: PF0  PF1  PC7  PC6
 180  */
 181 static void unselect_cols(void)
 182 {
 183     DDRF |=   0b00000011;
 184     PORTF &= ~0b00000011;
 185     DDRC |=   0b11000000;
 186     PORTC &= ~0b11000000;
 187 }
 188
 189 static void select_col(uint8_t col)
 190 {
 191     switch (col) {
 192         case 0:
 193             PORTF |= (1<<0);
 194             break;
 195         case 1:
 196             PORTF |= (1<<1);
 197             break;
 198         case 2:
 199             PORTC |= (1<<7);
 200             break;
 201         case 3:
 202             PORTC |= (1<<6);
 203             break;
 204     }
 205 }